drm/fbdev-dma: Support struct drm_driver.fbdev_probe

Rework fbdev probing to support fbdev_probe in struct drm_driver
and reimplement the old fb_probe callback on top of it. Provide an
initializer macro for struct drm_driver that sets the callback
according to the kernel configuration.

This change allows the common fbdev client to run on top of DMA-
based DRM drivers.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240924071734.98201-6-tzimmermann@suse.de

1 files changed, 36 insertions, 24 deletions

diff --git a/drivers/gpu/drm/drm_fbdev_dma.c b/drivers/gpu/drm/drm_fbdev_dma.c
index b0602c4f3628..9ce754ebe18e 100644
--- a/drivers/gpu/drm/drm_fbdev_dma.c
+++ b/drivers/gpu/drm/drm_fbdev_dma.c
@@ -105,6 +105,40 @@ static const struct fb_ops drm_fbdev_dma_deferred_fb_ops = {
 static int drm_fbdev_dma_helper_fb_probe(struct drm_fb_helper *fb_helper,
 					 struct drm_fb_helper_surface_size *sizes)
 {
+	return drm_fbdev_dma_driver_fbdev_probe(fb_helper, sizes);
+}
+
+static int drm_fbdev_dma_helper_fb_dirty(struct drm_fb_helper *helper,
+					 struct drm_clip_rect *clip)
+{
+	struct drm_device *dev = helper->dev;
+	int ret;
+
+	/* Call damage handlers only if necessary */
+	if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
+		return 0;
+
+	if (helper->fb->funcs->dirty) {
+		ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
+		if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret))
+			return ret;
+	}
+
+	return 0;
+}
+
+static const struct drm_fb_helper_funcs drm_fbdev_dma_helper_funcs = {
+	.fb_probe = drm_fbdev_dma_helper_fb_probe,
+	.fb_dirty = drm_fbdev_dma_helper_fb_dirty,
+};
+
+/*
+ * struct drm_fb_helper
+ */
+
+int drm_fbdev_dma_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
+				     struct drm_fb_helper_surface_size *sizes)
+{
 	struct drm_client_dev *client = &fb_helper->client;
 	struct drm_device *dev = fb_helper->dev;
 	bool use_deferred_io = false;
@@ -147,6 +181,7 @@ static int drm_fbdev_dma_helper_fb_probe(struct drm_fb_helper *fb_helper,
 		goto err_drm_client_buffer_delete;
 	}
 
+	fb_helper->funcs = &drm_fbdev_dma_helper_funcs;
 	fb_helper->buffer = buffer;
 	fb_helper->fb = fb;
 
@@ -210,30 +245,7 @@ err_drm_client_buffer_delete:
 	drm_client_framebuffer_delete(buffer);
 	return ret;
 }
-
-static int drm_fbdev_dma_helper_fb_dirty(struct drm_fb_helper *helper,
-					 struct drm_clip_rect *clip)
-{
-	struct drm_device *dev = helper->dev;
-	int ret;
-
-	/* Call damage handlers only if necessary */
-	if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
-		return 0;
-
-	if (helper->fb->funcs->dirty) {
-		ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
-		if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret))
-			return ret;
-	}
-
-	return 0;
-}
-
-static const struct drm_fb_helper_funcs drm_fbdev_dma_helper_funcs = {
-	.fb_probe = drm_fbdev_dma_helper_fb_probe,
-	.fb_dirty = drm_fbdev_dma_helper_fb_dirty,
-};
+EXPORT_SYMBOL(drm_fbdev_dma_driver_fbdev_probe);
 
 /*
  * struct drm_client_funcs